CN110360134B

CN110360134B - Combined structure of external rotor brushless motor and centrifugal wind wheel

Info

Publication number: CN110360134B
Application number: CN201910679560.7A
Authority: CN
Inventors: 张志通
Original assignee: 萧进兴; 张志通
Current assignee: Xiao Jinxing
Priority date: 2019-07-26
Filing date: 2019-07-26
Publication date: 2020-11-27
Anticipated expiration: 2039-07-26
Also published as: CN110360134A

Abstract

The invention relates to a combination structure of an external brushless motor and a centrifugal wind wheel, which consists of a left connection disc and a right connection disc, wherein the left connection disc and the right connection disc can quickly finish the mutual connection and fixation of the external brushless motor and the centrifugal wind wheel, so that the process procedure cost of the mutual connection and fixation of the external brushless motor and the centrifugal wind wheel can be greatly saved in the process of mass production of centrifugal worm wheel fan products, and when the external brushless motor and the centrifugal wind wheel which are fixedly connected are placed in a volute of the centrifugal worm wheel fan for air suction and air exhaust, the arc part of the left connection disc and the arc part of the right connection disc have the effect of flow guiding, thereby increasing the wind pressure output of the centrifugal worm wheel fan and reducing the noise value during the integral operation.

Description

Combined structure of external rotor brushless motor and centrifugal wind wheel

Technical Field

The invention relates to a combination structure of an external brushless motor and a centrifugal wind wheel, belonging to the field of centrifugal worm-wheel fans, which consists of a left connection disc and a right connection disc, wherein the left connection disc and the right connection disc can quickly finish the mutual connection and fixation of the external brushless motor and the centrifugal wind wheel, so that the process procedure cost of the mutual connection and fixation of the external brushless motor and the centrifugal wind wheel can be greatly saved in the process of mass production of centrifugal worm-wheel fan products, and when the external brushless motor and the centrifugal wind wheel which are fixedly connected are placed in a volute of the centrifugal worm-wheel fan for air suction and air exhaust actuation, the arc part of the left connection disc and the arc part of the right connection disc have the effect of guiding flow, the wind pressure output of the centrifugal worm-wheel fan can be increased, and the noise value during the integral operation can be reduced.

Background

Referring to fig. 1 to 3, a structure of a conventional external brushless motor includes: a fixed shaft 10, which is a round bar made of metal material, and has two axial end shafts each having a flat face 11, and a trunking duct 12 recessed inward on the surface of one of the end shafts, and a through hole 13 (as shown in fig. 3) extending outward from the shaft surface at a position near the bottom of the trunking duct 12; a shaft sleeve 20, which is a circular tube fixed between the communication hole 13 of the fixed shaft 10 and the shaft end surface, and the bottom of which is provided with a circle of outer flange 21 (as shown in fig. 1); a stator coil 30, which is a cylinder formed by overlapping a plurality of silicon steel sheets 31 and then surrounding the silicon steel sheets with enameled wires 32, wherein an axial hole 33 is formed in the center of the overlapped silicon steel sheets 31 in a penetrating manner, and the stator coil is connected with the wound enameled wires with electric wires W (as shown in fig. 3); a ring magnet 40, which is a polar anisotropic permanent magnet ring body sintered from iron oxide material, the magnetic force of the magnetic poles inside the ring body is arranged in inner diameter orientation, and the diameter of the inner ring is slightly larger than the outer diameter of the silicon steel sheet 31 of the stator coil 30; a hollow casing 50, which is a hollow circular tube body sleeved and fixed on the outer annular surface of the ring magnet 40, the diameter of the inner ring of the hollow circular tube body is the same as that of the outer ring of the ring magnet 40, and the hollow circular tube body and the outer annular surface of the ring magnet 40 are combined and fixed with each other in a close fit tolerance mode (as shown in fig. 3); and two side covers 60, which are disk bodies covering the two end faces of the hollow shell 50, respectively, a through hole 63 is penetrated through the centers of the outer side face 61 and the inner side face 62, a bearing 64 is fixedly sleeved on the through hole 63 of the inner side face 62, the bore diameter of the inner bore of the bearing 64 is the same as the shaft outer diameter of the fixed shaft 10, a ring of convex ring 65 is convexly arranged on the outer peripheral face of the inner side face 62, the outer diameter of the convex ring 65 is the same as the inner ring face diameter of the hollow shell 50, and the convex ring are mutually pressed and combined and fixed in a close fit tolerance mode (as shown in fig. 3).

As shown in fig. 2 to 18, the conventional external brushless motor assembly process includes the steps of first pressing the outer circumferential surface of the ring magnet 40 into the inner circumferential surface of the hollow housing 50 (as shown in fig. 4 to 6), positioning the sleeve 20 from the outer flange 21 thereof toward the communication hole 13 of the stationary shaft 10 until the outer flange 21 approaches the communication hole 13 (as shown in fig. 8 and 9), then aligning the stator coil 30 with the electric wire W toward the axial end of the stationary shaft 10 without the slot tube 12 (as shown in fig. 10 and 11), positioning the axial hole 33 thereof on the outer circumferential surface of the sleeve 20 until the stator coil contacts the outer flange 21 of the sleeve 20, inserting the electric wire W into the slot tube 12 from the communication hole 13 of the stationary shaft 10 until the end of the electric wire W passes through the axial end of the stationary shaft 10 (as shown in fig. 12), and then aligning and positioning the ring magnet 40 and the hollow housing 50 fixed to each other and the stator coil 30 to be positioned on the stator coil 30 Finally, the two bearings 64 are respectively inserted into the through holes 63 on the inner side surfaces of the two side covers 60 (as shown in fig. 14 and 15), and then are respectively inserted through the two shaft ends of the fixed shaft 10 until the circular convex rings 65 of the two side covers 60 are pressed into the inner ring surface of the end portion of the hollow housing 50 (as shown in fig. 16 and 17), thereby completing the assembly of the conventional external brushless motor (as shown in fig. 2 and 3).

As shown in fig. 18 to 21, the structure of a conventional centrifugal wind wheel 70 is composed of two rim ring plates 71, a middle partition plate 72 and a plurality of straight blades 73, wherein the plurality of straight blades 73 are arranged in parallel to each other to form a circular ring shape rapidly and penetrate through the middle partition plate 72 by the operation of the conventional insert special machine, and finally, the two end parts of all the straight blades 73 are inserted and fixed on the two frame ring plates 71 respectively, all the straight blades 73 are perpendicular to the frame ring plates 71 and the middle partition plate 72 and are fixed together (as shown in fig. 20 and 21), and the middle partition plate 72 is located at the center between the two frame ring plates 71 and has a circular opening 74 at the center, and a plurality of through holes 75 arranged at the same interval are formed on the peripheral plate surface of the circular opening 74 for assembling and fixing the external brushless motor 1.

As shown in fig. 18 to 24, the above-mentioned combination structure of the conventional external brushless motor 1 and the conventional centrifugal wind wheel 70 is formed by connecting and fixing the external brushless motor 1 and the centrifugal wind wheel 70 with each other through a hollow ring body 80, the hollow ring body 80 is a cylinder, a circular hole 81 is formed in the center, the diameter of the circular hole 81 is the same as the outer diameter of the hollow housing 50 of the external brushless motor 1, the hollow ring body can be sleeved on the outer diameter surface of the hollow housing 50 of the external brushless motor 1, a disc 82 is protruded outward near one end of the circular hole 81, the disc 82 and the circular hole 81 are perpendicular to each other, a plurality of threaded holes 83 are formed on the disc 82, and the number and the positions of the threaded holes 83 are the same as and correspond to the number and the positions of the through holes 75 formed in the middle partition plate 72 of the centrifugal wind wheel 70 (as shown in fig. 20 and 22). During the combination, the circular hole 81 of the hollow lantern ring body 80 is firstly sleeved on the surface of the hollow shell 50 of the external brushless motor 1, then welding is carried out at the position where the two ends of the circular hole 81 of the hollow lantern ring body 80 are contacted (as shown in four black triangle parts in fig. 23), so that the hollow lantern ring body 80 and the external brushless motor 1 are combined and fixed with each other (note: some production processes do not adopt a welding mode, quick-drying adhesive is coated and coated on the surface of the hollow shell 50 and the wall surface of the circular hole 81 of the hollow lantern ring body 80 to achieve the connection, but after a period of operation, glue aging occurs to cause the defect of mutual slippage between the hollow shell 50 and the hollow lantern ring body 80, so that the glue is abandoned), then the external brushless motor 1 is picked up and placed in the circular opening 74 of the centrifugal wind wheel 70, and until the disc 82 of the hollow lantern ring body 80 abuts against the middle partition plate 72 of the centrifugal wind wheel 70, finally, a screw S is inserted through each through hole 75 of the centrifugal wind wheel 70 and screwed into the screw hole 83 of the disc 82 (as shown in fig. 24), so as to complete the mutual assembly and fastening of the external brushless motor 1 and the centrifugal wind wheel 70.

As shown in fig. 3, 18, 19 and 25, the conventional external brushless motor 1 and the hollow ferrule 80 are assembled and then placed in the conventional volute 90, and the cutting planes 11 at the two axial ends of the fixed shaft 10 of the external brushless motor 1 are inserted into the central holes 93 of the fixing brackets 92 of the two side plates 91 in the volute 90 (as shown in fig. 19 and 25), so as to complete the production of the conventional centrifugal type turbo fan 2 (as shown in fig. 18). During operation, the electric wire W exposed outside the stationary shaft 10 is connected to an external circuit driver (not shown), and when a power is input, the circuit driver passes a current through the stator coil 30 of the external brushless motor 1 to magnetically induce the ring magnet 40 to start rotating (as shown in fig. 3), and synchronously rotate the hollow housing 50 (as shown in fig. 25, the two shaft ends of the stationary shaft 10 in this state are respectively fixed in the central holes 93 of the fixing brackets 92 of the two side plates 91 in the volute 90, so that the entire stationary shaft 10 cannot rotate), and sucks in the inlet air Wi outside the two side plates 91 in the volute 90, and discharges the pressurized outlet air Wo from the outlet 94 of the volute 90 by the centrifugal wind wheel 70 (as shown in fig. 18). Therefore, the conventional centrifugal worm gear 2 is usually installed in a household range hood for providing a power function of sucking and exhausting smoke, or installed in an air cleaner for providing a power function of sucking dirty air in a room and exhausting clean air after filtering the dirty air by a filter, and other equipment requiring the functions of sucking and exhausting air, so that the yield required by the centrifugal worm gear 2 per year is very large, as exemplified by the household range hood, counted by the market research ltd of joy-go in beijing, the annual sales number of the range hood in 2018 reaches 1 million (not including the number of after-sales market new machines), and as shown in the aforementioned fig. 19 to 25, the conventional external brushless motor 1 and the conventional centrifugal wind wheel 70 must be locked and connected by a large number of screws S in a mass production combination structure, therefore, for the productivity demand of more than 1 million machines per year, it will consume a lot of assembly time and cost of using a lot of screws, and when the centrifugal wind wheel 70 and the hollow lantern ring body 80 are sleeved with each other, it is necessary to visually determine in advance whether the insertion direction of the centrifugal wind wheel 70 is correct, which will also increase the difficulty of the assembly process and affect the speed of mass production assembly, and meanwhile, the hollow lantern ring body 80 needs to be welded after being sleeved on the surface of the hollow housing 50 of the external brushless motor 1, so the defect of this is very important.

Disclosure of Invention

The technical scheme of the invention is as follows: a combination structure of an external rotor brushless motor and a centrifugal wind wheel, comprising: an external brushless motor, which has stator coil and ring magnet inside, and outside is composed of a tubular hollow shell, two disc-shaped side covers and a fixed shaft, wherein, the two side covers are pressed on the two end ports of the hollow shell, the fixed shaft is set on the central shaft of the hollow shell, and the end parts of the two shafts are out of the two side covers; the centrifugal wind wheel is formed by combining two frame ring plates, a middle partition plate and a plurality of straight blades, wherein the straight blades are arranged in parallel to form a circular ring shape and penetrate through the middle partition plate, and then the two tail end parts of the straight blades are respectively inserted and fixed on the two frame ring plates, the middle partition plate is positioned in the central position between the two frame ring plates, a circular opening is arranged in the center of the middle partition plate in a penetrating manner, and a plurality of square through holes which are arranged at the same intervals are formed in the peripheral plate surface of the circular opening; a left connecting disc, a hollow disc body which is integrally formed by punching and molding metal materials, wherein the upper half part of the hollow disc body is provided with a circular tube body, the lower half part of the hollow disc body is provided with a flat disc body, and the circular tube body and the disc body are connected into a whole by gradually opening a horn-shaped arc line part from the bottom of the circular tube body to the direction of the disc body, and the circular tube body and the disc body are mutually vertical, wherein the center of the circular tube body is penetrated with a penetrating hole which can be sleeved on the surface of a hollow shell of an externally rotating brushless motor, the disc body is penetrated with a plurality of square sleeve holes, and the number and the positions of the square sleeve holes are the same as and correspond to the number and the positions of the upper-shaped penetrating holes of the middle partition plate of the centrifugal wind wheel; and a right coupling disc, a hollow disc body which is integrally formed by punching and molding metal materials, wherein the upper half part of the hollow disc body is provided with a circular tube body, the lower half part of the hollow disc body is provided with a flat disc body, and the circular tube body and the disc body are connected into a whole by gradually opening a horn-shaped arc line part from the bottom of the circular tube body to the direction of the disc body, and the circular tube body is vertical to the disc body.

A combination structure of an external rotor brushless motor and a centrifugal wind wheel, comprising: an external brushless motor, which has stator coil and ring magnet inside, and outside is composed of a round tube hollow shell, two disc side covers and a fixed shaft, wherein, the two side covers are pressed on the two end ports of the hollow shell, the fixed shaft is set on the center shaft of the hollow shell, the end parts of the two shafts are through the two side covers, and several grooves are set on the outmost edge surface of the two side covers; the centrifugal wind wheel is formed by combining two frame ring plates, a middle partition plate and a plurality of straight blades, wherein the straight blades are arranged in parallel to form a circular ring shape and penetrate through the middle partition plate, and then the two tail end parts of the straight blades are respectively inserted and fixed on the two frame ring plates, the middle partition plate is positioned in the central position between the two frame ring plates, a circular opening is arranged in the center of the middle partition plate in a penetrating manner, and a plurality of square through holes which are arranged at the same intervals are formed in the peripheral plate surface of the circular opening; a left connecting disc, a hollow disc body which is integrally formed by punching and molding metal materials, wherein the upper half part of the hollow disc body is provided with a circular tube body, the lower half part of the hollow disc body is provided with a flat disc body, and the circular tube body and the disc body are connected into a whole by gradually opening a horn-shaped arc line part from the bottom of the circular tube body to the direction of the disc body, and the circular tube body and the disc body are mutually vertical, wherein a through hole is penetrated in the center of the circular tube body and can be sleeved on the surface of a hollow shell of an externally rotating brushless motor, a plurality of square sleeve holes are penetrated on the disc body, the number and the positions of the square sleeve holes are the same as and correspond to the number and the positions of the upper through holes of the middle partition plate of the centrifugal wind wheel, and a plurality of stopping pieces are convexly arranged on the wall surface of an inner edge hole which is connected with the through hole on the end; and a right coupling disc, which is a hollow disc body integrally formed by punching and molding metal materials, wherein the upper half part of the right coupling disc body is provided with a circular tube body, the lower half part of the right coupling disc body is provided with a flat disc body, and the lower half part of the right coupling disc body is arranged from the bottom of the circular tube body to the direction of the disc body, the circular tube body and the disc body are connected into a whole by the gradually opened trumpet-shaped arc line part, and the circular tube body and the disc body are mutually vertical, wherein, a through hole is arranged at the center of the round tube body in a penetrating way and can be sleeved on the surface of the hollow shell of the externally rotating brushless motor, the disc body faces to the direction opposite to the direction of the circular tube body, a plurality of square inserting pieces which are vertical to the disc body are convexly arranged, the number and the position of the square inserting pieces are the same as and correspond to the number and the position of the through holes formed above the middle partition plate of the centrifugal wind wheel, and a plurality of stopping pieces are convexly arranged on the wall surface of the inner edge hole connecting the end surface of the round pipe body and the through holes.

A combined motor and rotor construction comprising: a motor, a wind wheel, this wind wheel includes the fixed plate, a combination part, and this combination part is connected between this motor and this wind wheel, fixes this motor in this wind wheel through this combination part, makes the focus coincidence of this motor and this wind wheel, and this combination part includes motor link end and fixed plate link end, and wherein, this motor link end tight fit connects on this motor, and this fixed plate link end tight fit connects on this wind wheel.

The utility model provides a combined part, this combined part is connected between motor and wind wheel, fix this motor in this wind wheel through this combined part, make the focus coincidence of this motor and this wind wheel, this combined part includes motor link and fixed plate link, wherein, this motor link close-fitting is connected on this motor, this fixed plate link close-fitting is connected on this wind wheel, this close-fitting is connected for the close-fitting connection that the material deformation through this combined part self formed, or, the material deformation through this combined part self and this motor, the close-fitting connection that the material deformation of fixed plate self formed.

A method for combining a motor and a wind wheel comprises fixing the motor in the wind wheel through a combination part to make the center of gravity of the motor coincide with that of the wind wheel, wherein the combination part comprises a motor connecting end and a fixing plate connecting end, the motor connecting end is tightly connected to the motor, the fixing plate connecting end is tightly connected to the wind wheel, the tight connection is formed by the material deformation of the combination part, or the tight connection formed by the material deformation of the combination part and the material deformation of the motor and the fixing plate is not the fixed connection formed by welding and screwing, the combination part comprises a left connection disc and a right connection disc, the motor connecting end and the fixing plate connecting end are respectively arranged on the left connection disc and the right connection disc, wherein the fixing plate connecting ends on the left connection disc and the right connection disc are connected together, so that the left connecting disc and the right connecting disc are connected to form the combined component.

The invention has the beneficial effects that: the invention provides a combined structure of an external rotor brushless motor and a centrifugal wind wheel, which comprises: a conventional external brushless motor, which has a stator coil and a ring magnet inside and an outside composed of a tubular hollow housing, two disk-shaped side covers and a fixed shaft, wherein the two side covers are respectively pressed on two end ports of the hollow housing, the fixed shaft is inserted into the central shaft of the hollow housing, and the end parts of the two shafts respectively penetrate out of the two side covers; the centrifugal wind wheel is formed by combining two frame ring plates, a middle partition plate and a plurality of straight blades, wherein the straight blades are arranged in parallel to form a circular ring shape and penetrate through the middle partition plate, and then the two tail end parts of the straight blades are respectively inserted and fixed on the two frame ring plates, the middle partition plate is positioned in the central position between the two frame ring plates, a circular opening is arranged in the center of the middle partition plate in a penetrating manner, and a plurality of square through holes which are arranged at the same intervals are formed in the peripheral plate surface of the circular opening; a left connecting disc, which is a hollow disc body integrally formed by metal materials, the upper half part of the left connecting disc is provided with a round tube body, the lower half part of the left connecting disc is provided with a flat disc body, and the round tube body and the disc body are connected into a whole by gradually opening a horn-shaped arc line part from the bottom of the round tube body to the direction of the disc body, and the round tube body and the disc body are mutually vertical, wherein, a through hole is arranged at the center of the round tube body, the inner diameter of the through hole is the same as the outer diameter of the hollow shell of the conventional external brushless horse, the size matching tolerance of the inner diameter and the outer diameter is tight fit, so that the round tube body can be firmly sleeved on the surface of the hollow shell of the conventional external brushless horse, a plurality of square sleeve holes are arranged on the disc body, the size of the cross section of the square sleeve holes is equal to or slightly larger than the size of the cross section of the through hole above the middle, the number and the positions of the square sleeve holes are the same as and corresponding to those of the through holes formed above the intermediate partition plate of the centrifugal wind wheel; and a right coupling disc, which is a hollow disc body integrally formed by punching metal material, the upper half part of the hollow disc body is provided with a round tube body, the lower half part of the hollow disc body is provided with a flat disc body, and the round tube body and the disc body are connected into a whole by gradually opening a horn-shaped arc part from the bottom of the round tube body to the direction of the disc body, and the round tube body and the disc body are mutually vertical, wherein a through hole is penetrated in the center of the round tube body, the inner diameter of the through hole is the same as the outer diameter of a hollow shell of a conventional external brushless motor, the size matching tolerance of the inner diameter and the outer diameter is tight fit, so that the round tube body can be firmly sleeved on the surface of the hollow shell of the conventional external brushless motor, a plurality of square inserting pieces mutually vertical to the disc body are protruded on the disc body in the direction opposite to the round tube body, and the size of the cross section of the square inserting pieces is slightly smaller than that of the through hole above the centrifugal partition plate of the, the number and the positions of the square inserting pieces are the same as and corresponding to those of the through holes formed above the middle partition plate of the centrifugal wind wheel. By the design structure of the left connecting disc and the right connecting disc, the manufacturing process cost of the mutual connection and fixation of the external rotating brushless motor and the centrifugal wind wheel can be greatly saved in the process of mass production of centrifugal worm wheel fan products, and meanwhile, the cost of using screws and the implementation of welding can be avoided. In addition, the invention provides a combination structure of an external rotation brushless motor and a centrifugal wind wheel, and by the design structure of a left connecting disc and a right connecting disc, the combination structure is connected and fixed with the external rotation brushless motor and the centrifugal wind wheel and is arranged in a volute to perform air suction and air exhaust actions, the arc part of the left connecting disc and the arc part of the right connecting disc have the effect of guiding flow, thereby increasing the wind pressure output of the centrifugal worm wheel fan and reducing the noise value during the integral operation.

Drawings

Fig. 1 is an exploded perspective view of a conventional external brushless motor.

Fig. 2 is a perspective assembly view of a conventional external brushless motor.

Fig. 3 is a cross-sectional view taken along line 3-3 of fig. 2.

Fig. 4 is a cross-sectional view taken along line 4-4 of fig. 1.

Fig. 5 is a cross-sectional view taken along line 5-5 of fig. 1.

FIG. 6 is a sectional view of a conventional external brushless motor with a combination of a ring magnet and a hollow housing.

Fig. 7 is a cross-sectional view taken along line 7-7 of fig. 1.

Fig. 8 is a cross-sectional view taken along line 8-8 of fig. 1.

FIG. 9 is a sectional view of a shaft sleeve and a shaft of a conventional external brushless motor.

Fig. 10 is a cross-sectional view taken along line 10-10 of fig. 1.

Fig. 11 is a sectional view showing the combination of a stator coil and a shaft sleeve in the conventional external rotor brushless motor.

FIG. 12 is a cross-sectional view of a conventional external brushless motor.

FIG. 13 is a second cross-sectional view of the conventional external brushless motor.

Fig. 14 is a cross-sectional view taken along line 14-14 of fig. 1.

FIG. 15 is a third schematic sectional view of the conventional external brushless motor.

FIG. 16 is a fourth schematic sectional view of the conventional external brushless motor.

FIG. 17 is a fifth schematic sectional view of a conventional external rotor brushless motor.

Fig. 18 is a perspective view of a conventional centrifugal turbo fan.

Fig. 19 is an exploded perspective view of a conventional centrifugal turbo fan.

Fig. 20 is a perspective view of a conventional centrifugal wind wheel.

Fig. 21 is a cross-sectional view taken along line 21-21 of fig. 20.

FIG. 22 is a cross-sectional view of a conventional external brushless motor and a hollow ferrule.

FIG. 23 is a second cross-sectional view of the assembly of the external brushless motor and the hollow ferrule.

Fig. 24 is a sectional view of a conventional external brushless motor and centrifugal rotor.

Fig. 25 is a schematic cross-sectional view of a conventional centrifugal turbo fan.

Fig. 26 is a perspective view of the first embodiment of the present invention installed in a conventional centrifugal type turbo fan.

Fig. 27 is a perspective exploded view of the first embodiment of the present invention installed in a conventional centrifugal type worm gear fan.

Fig. 28 is an exploded perspective view of the first embodiment of the present invention.

Fig. 29 is a perspective view of the left coupling plate in the first embodiment of the present invention.

Fig. 30 is a cross-sectional view taken along line 30-30 of fig. 29.

FIG. 31 is a perspective view of the right splice tray in the first embodiment of the present invention.

Fig. 32 is a cross-sectional view taken along line 32-32 of fig. 31.

FIG. 33 is a cross-sectional view of the first embodiment of the present invention.

FIG. 34 is a second assembled cross-sectional view of the first embodiment of the present invention.

FIG. 35 is a third assembled cross-sectional view of the first embodiment of the present invention.

FIG. 36 is a fourth cross-sectional view of the first embodiment of the present invention.

FIG. 37 is a fifth cross-sectional view of the first embodiment of the present invention.

FIG. 38 is a sixth sectional view of the first embodiment of the present invention.

FIG. 39 is a sectional view of the first embodiment of the present invention installed in a conventional centrifugal type turbo fan.

FIG. 40 is a perspective view of the left coupling plate in the second embodiment of the present invention.

Fig. 41 is a cross-sectional view taken along line 41-41 of fig. 40.

FIG. 42 is a perspective view of the right splice tray in a second embodiment of the present invention.

Fig. 43 is a cross-sectional view taken along line 43-43 of fig. 42.

FIG. 44 is a schematic view of a hollow housing of an external brushless motor according to a second embodiment of the present invention.

Fig. 45 is a perspective view of a side cover of an external brushless motor according to a second embodiment of the present invention.

Fig. 46 is a top view of a side cover of an external brushless motor according to a second embodiment of the present invention.

FIG. 47 is a schematic sectional view of the second embodiment of the present invention.

FIG. 48 is a second assembled cross-sectional view of the second embodiment of the present invention.

FIG. 49 is a third assembled cross-sectional view of the second embodiment of the present invention.

FIG. 50 is a side view of the right coupling plate and side cover combination of the second embodiment of the present invention.

FIG. 51 is a fourth schematic sectional view of the second embodiment of the present invention.

FIG. 52 is a fifth cross-sectional view of the second embodiment of the present invention.

FIG. 53 is a sixth sectional view of the second embodiment of the present invention.

FIG. 54 is a sectional view of a second embodiment of the present invention installed in a conventional centrifugal type turbo fan.

Detailed Description

As shown in fig. 1 to 5 and 26 to 32, a first embodiment of a combination structure of an external rotor brushless motor and a centrifugal wind wheel according to the present invention comprises: a conventional external brushless motor 1, which has a stator coil 30 and a ring magnet 40 inside and a circular tube-shaped hollow housing 50, two disk-shaped side covers 60 and a fixing shaft 10 outside, wherein the two side covers 60 are respectively pressed on two end ports of the hollow housing 50, the fixing shaft 10 is inserted into the central axis of the hollow housing 50, and the end portions of the two shafts respectively penetrate out of the two side covers 60; a centrifugal wind wheel 700, which is composed of two frame ring plates 701, a middle partition plate 702 and a plurality of straight blades 703, wherein the plurality of straight blades 703 are arranged in parallel to each other to form a circular ring shape and penetrate through the middle partition plate 702, and then two end parts of the plurality of straight blades 703 are respectively inserted and fixed on the two frame ring plates 701, wherein the middle partition plate 702 is positioned at the central position between the two frame ring plates 701, a circular opening 704 is arranged at the center, and a plurality of square through holes 705 (as shown in fig. 28) are arranged at the same interval on the peripheral plate surface of the circular opening 704; a left coupling disc 200, which is a hollow disc body integrally formed by punching and pressing metal material, the upper half part of which is provided with a circular tube 201, the lower half part of which is provided with a flat disc 202, and the bottom of the circular tube 201 is towards the disc 202, and a trumpet-shaped arc part 203 is gradually opened, so that the circular tube 201 and the disc 202 are connected into a whole, and the circular tube 201 and the disc 202 are perpendicular to each other, wherein a through hole 204 is formed in the center of the circular tube 201, and the inner diameter D1 (shown in fig. 30) of the through hole 204 is the same as the outer diameter D2 (shown in fig. 5) of the hollow housing 50 of the conventional external brushless motor 1, and the dimensional matching Tolerance (Tolerance) of the inner diameter D1 and the outer diameter D2 is tight fit (Tolerance), so that the circular tube 201 can be firmly sleeved on the surface of the hollow housing 50 of the conventional brushless external brushless motor 1, and a plurality of square sleeve holes 205 are formed in the disc body 202, the section size of the square registration hole 205 is equal to or slightly larger than the section size of the through hole 705 above the middle partition 702 of the centrifugal wind wheel 700, and the number and the position of the square registration hole 205 are the same as and corresponding to the number and the position of the through hole 705 above the middle partition 702 of the centrifugal wind wheel 700; and

a right coupling disc 300, which is a hollow disc body integrally formed by punching and pressing metal material, the upper half part of which is provided with a circular tube body 301, the lower half part of which is provided with a flat disc body 302, and the bottom of the circular tube body 301 is towards the disc body 302, and the circular tube body 301 and the disc body 302 are connected into a whole by gradually opening a horn-shaped arc line part 303, and the circular tube body 301 and the disc body 302 are perpendicular to each other, wherein a through hole 304 is formed in the center of the circular tube body 301, and the inner diameter D5 (shown in fig. 32) of the through hole 304 is the same as the outer diameter D2 (shown in fig. 5) of the hollow housing 50 of the conventional external brushless motor 1, and the dimensional matching Tolerance (Tolerance) of the inner diameter D5 and the outer diameter D2 is tight fit (Tolerance), so that the circular tube body 301 can be firmly sleeved on the surface of the hollow housing 50 of the conventional external brushless motor 1, and the disc body 302 faces the direction opposite to the circular tube body 201, and a plurality of square inserting pieces 305 which are mutually vertical to the disc body 302 are convexly arranged, the section size of each square inserting piece 305 is slightly smaller than the hole section size of the through hole 705 above the middle partition plate 702 of the centrifugal wind wheel 700, and the number and the positions of the square inserting pieces 305 are the same as and corresponding to the number and the positions of the through holes 705 above the middle partition plate 702 of the centrifugal wind wheel 700.

Referring to fig. 33 to 39, the combining steps of the first embodiment of the combination structure of the external brushless motor and the centrifugal rotor according to the present invention and the conventional centrifugal rotor 700 are as follows, first, the disc body 302 of the right coupling disc 300 is sleeved on the surface of the hollow housing 50 facing one end of the external brushless motor 1 (as shown in fig. 33) until the end of the hole penetrating the opening 304 is aligned with the end of the hollow housing 50 (as shown in fig. 34), then, any one of the frame ring plates 701 of the centrifugal rotor 700 (without visual pre-judgment that the frame ring plate 701 is correct) is abutted against the right coupling disc 300, and all the square through holes on the middle partition 702 of the centrifugal rotor 700 are abutted against the corresponding square insertion pieces 305 on the disc body 302 of the right coupling disc 300 (as shown in fig. 35 and its enlarged view), and then the disc body 202 of the left coupling disc 200 is faced to the external brushless motor 1 by the right coupling disc 300 The other end of the hollow housing 50 is sleeved on the surface (as shown in fig. 36), and until the end of the hole penetrating through the opening 204 is aligned with the other end of the hollow housing 50, at this time, all the square sleeve holes 205 on the disc body 202 in the left coupling disc 200 are also exactly sleeved on the square insertion pieces 305 on the disc body 302 in all the right coupling discs 300 (as shown in fig. 37 and the enlarged view thereof), and finally, the square insertion pieces 305 penetrating through the square sleeve holes 205 are bent upwards and attached on the disc body 202 (as shown in fig. 38 and the enlarged view thereof), so that the middle partition plate 702 of the centrifugal wind wheel 700 can be clamped between the square sleeve holes 205 and the square insertion pieces 305 (as shown in fig. 38), and the procedure of brushless combination and fixation of the external rotor motor 1 and the centrifugal wind wheel 700 can be rapidly achieved.

Therefore, by the design structure of the left connection plate 200 and the right connection plate 300 of the present invention, the cost of the process steps for connecting and fixing the external brushless motor 1 and the centrifugal wind wheel 700 can be greatly saved during the mass production of the centrifugal type worm wheel fan 2 product, and the cost of the screw and the welding operation can be saved, in addition, when the external brushless motor 1 and the centrifugal wind wheel 700 are placed in the volute 90 for the air suction and exhaust actions, the arc portion 203 of the left connection plate 200 and the arc portion 303 of the right connection plate 300 have the effect of guiding the flow (as shown by the arrows of the air inlet Wi and the air outlet Wo in fig. 39), which not only increases the wind pressure output of the centrifugal type worm wheel fan 2, but also reduces the noise value during the whole operation.

As shown in fig. 40 to 46, a second embodiment of the combination structure of the external brushless motor and the centrifugal wind wheel according to the present invention is shown, wherein a plurality of stopping pieces 206 (shown in fig. 40 and 41) are further protruded from the inner wall surface of the through hole 204 connecting the end surface of the circular tube 201 of the left coupling plate 200, a plurality of stopping pieces 306 (shown in fig. 42 and 43) are also protruded from the inner wall surface of the through hole 304 connecting the end surface of the circular tube 301 of the right coupling plate 300, a plurality of grooves 66 (shown in fig. 45 and 46) are further protruded from the outermost wall surface of the two side covers 60 of the external brushless motor 1, and a plurality of annular grooves 51 are further recessed from the outer surface of the hollow housing 50 near the two ports for receiving a vibration isolating ring C (shown in fig. 44), wherein the plurality of stopping pieces 206 of the circular tube 201, the plurality of stopping pieces 306 on the circular tube 301, and the plurality of grooves 66 on the two side covers 60, the three are equal in number and corresponding in position.

Referring to fig. 47 to 54, the assembly steps of the second embodiment of the assembly structure of the external brushless motor and the centrifugal wind wheel according to the present invention and the conventional centrifugal wind wheel 700 are as follows, firstly, the anti-vibration washer ring C is sleeved into the concave ring groove 51 of the hollow housing 50, then the disc body 302 of the right coupling disc 300 is sleeved on the surface of the hollow housing 50 at one end of the external brushless motor 1 (as shown in fig. 47 and 48) until the hole end penetrating the opening 304 is aligned with the end of the hollow housing 50 (as shown in fig. 49), at this time, each stopper 306 on the hole wall surface at the inner edge of the disc body 301 in the right coupling disc 300 is embedded into each concave groove 66 of one of the side covers 60 (as shown in the enlarged view of fig. 49 and fig. 50), then, any one of the frame ring plates 701 of the centrifugal wind wheel 700 (without visual pre-determining that all the frame ring plates 701 are correct) is attached to the right coupling disc 300, until all the square through holes 705 on the middle partition 702 of the centrifugal wind wheel 700 are fitted on the corresponding square insertion pieces 305 on the disc body 302 in the right coupling disc 300 (as shown in fig. 51), the disc body 202 of the left coupling disc 200 is fitted on the surface of the hollow housing 50 at the other end of the external brushless motor 1 in the manner of the right coupling disc 300 until the end of the through hole 204 is aligned with the other end of the hollow housing 50, and at this time, each stop piece 206 on the wall surface of the through hole in the inner edge of the disc body 201 in the left coupling disc 200 is also fitted into each groove 66 of the other side cover 60 (as shown in the left enlarged view of fig. 52), and all the square fitting holes 205 on the disc body 202 in the left coupling disc 200 are also fitted on the square insertion pieces 305 on the disc bodies 302 in all the right coupling disc 300 (as shown in the right enlarged view of fig. 52), finally, the square insertion piece 305 penetrating through the square fitting hole 205 is bent upward and attached to the disc body 202 (as shown in fig. 53 and its enlarged view), so that the middle partition 702 of the centrifugal wind wheel 700 is clamped between the square fitting hole 205 and the square insertion piece 305 (as shown in fig. 53), thereby rapidly achieving the process of assembling and fixing the external brushless motor 1 and the centrifugal wind wheel 700.

Furthermore, in the second embodiment of the present invention, each stopping piece 206 of the through hole 204 of the left coupling plate 200 and each stopping piece 306 of the through hole 304 of the right coupling plate 300 are respectively inserted into each groove 66 of the outermost surfaces of the two side covers 60 of the external brushless motor 1 (as shown in fig. 50), so that after the centrifugal type worm gear fan 2 is assembled, when the external brushless motor 1 is started and the centrifugal wind wheel 700 is synchronously driven to rotate, the better transmission function is achieved, and the mutual slip between the external brushless motor 1 and the centrifugal wind wheel 700 is never lost, and in addition, the design structure of the left coupling plate 200 and the right coupling plate 300 enables the manufacturing process cost of the mutual connection and fixation of the external brushless motor 1 and the centrifugal wind wheel 700 to be greatly saved during the mass production of the centrifugal type worm gear fan 2 product, and the screw cost and the welding operation can be avoided, in addition, the vibration generated by the rotation of the hollow housing 50 of the external brushless motor 1 is also absorbed by the vibration-proof washer ring C sleeved in the concave ring groove 51 of the hollow housing 50 (as shown in fig. 54), so as to have the effect of eliminating the vibration noise.

In summary, the present invention has the advantages of greatly saving the cost of the process for connecting and fixing the external brushless motor and the centrifugal wind wheel, eliminating the cost of screws and welding, increasing the wind pressure output of the centrifugal worm gear, reducing the noise value of the overall operation of the centrifugal worm gear, ensuring no mutual slip between the external brushless motor and the centrifugal wind wheel, and the like by the design structure of the left coupling plate and the right coupling plate, and thus the present invention is in line with the high utilization and creativity of the industry.

The invention and the design concept of the present application are summarized below with reference to the specific embodiments described above.

Referring to fig. 37 to 39 and 52 to 54, a combined motor and rotor structure includes.

A motor 1.

The wind wheel 700 comprises a fixing plate, the fixing plate is located at the center of the wind wheel 700, meanwhile, the fixing plate is located at the center of gravity of the wind wheel 700, and the wind wheels 700 on the two sides of the fixing plate have the same weight.

A combined part connected between the motor 1 and the wind wheel 700.

The motor 1 is fixed in the wind wheel 700 through the combined component, so that the center of gravity of the motor 1 coincides with that of the wind wheel 700, and the balance and the stability of the whole rotation are improved when the motor 1 drives the wind wheel 700 to rotate.

This modular unit includes motor connection end and fixed plate link end, and wherein, this motor connection end tight fit connects on this motor 1, and this fixed plate link end tight fit connects on this wind wheel 700.

The tight fit connection is formed by deformation of the material of the assembly member itself, and is not a fixed connection formed by welding, screwing, or the like.

The tight fit connection is formed by the material deformation of the combined component, or formed by the material deformation of the combined component and the material deformation of the motor 1 and the fixing plate.

Such as by tightening, pinching, or gripping due to dimensional tolerances thereof, by expanding with heat and contracting with cold, and so forth.

For example, the card can be inserted into the slot of the card slot by a card insertion structure, a plug-in structure, a projection groove structure, a rib slot groove structure, etc.

In particular embodiments, the combination includes a left coupling plate 200 and a right coupling plate 300.

The motor connecting end and the fixing plate connecting end are respectively disposed on the left coupling plate 200 and the right coupling plate 300.

Wherein, the fixing plate connecting ends of the left coupling plate 200 and the right coupling plate 300 are connected together, so that the left coupling plate 200 and the right coupling plate 300 are connected to form the combined component.

Referring to the above embodiments, the motor connecting ends of the left coupling plate 200 and the right coupling plate 300 may be the

circular tube bodies

201 and 301, and the fixing plate connecting ends of the left coupling plate 200 and the right coupling plate 300 may be the flat

circular tube bodies

202 and 302.

In practical applications, a damping member is disposed between the assembly and the motor 1, and the assembly is connected between the damping member and the fixing plate of the wind wheel 700, so that the motor 1 is not in direct contact with the fixing plate, thereby achieving a damping effect.

Referring to the above embodiment, the shock absorbing member may be the crash pad ring C.

In practical implementation, the motor 1 may be a conventional external brushless motor 1 in an embodiment, the wind wheel 700 may be a centrifugal wind wheel 700 in an embodiment, and the left coupling plate 200 and the right coupling plate 300 may have the same structure in an embodiment, which will not be described herein again.

Fig. 37 to 39, 52 to 54 show a combination unit connected between a motor 1 and a wind wheel 700.

For example, through the cramp, tighten, chucking etc. that its size fit tolerance formed, through the cramp, tighten, chucking etc. that expend with heat and contract with cold formed, still for example, through card-inserting structure, grafting structure, lug groove structure, protruding rib draw-in groove structure etc..

In a specific implementation, the assembly includes a left coupling disc 200 and a right coupling disc 300, the motor connecting end and the fixing plate connecting end are respectively disposed on the left coupling disc 200 and the right coupling disc 300, wherein the fixing plate connecting ends on the left coupling disc 200 and the right coupling disc 300 are connected together, so that the left coupling disc 200 and the right coupling disc 300 are connected to form the assembly.

The left coupling disc 200 is a hollow disc body integrally formed by punching metal material, the upper half part of the hollow disc body is provided with a circular tube body 201, the lower half part is provided with a flat disc body 202, and a trumpet-shaped arc part 203 is gradually opened from the bottom of the circular tube body 201 to the direction of the disc body 202, the circular tube body 201 and the disc body 202 are connected into a whole, and the circular tube body 201 and the disc body 202 are perpendicular to each other, wherein a through hole 204 is formed in the center of the circular tube body 201, the inner diameter D1 (shown in fig. 30) of the through hole 204 is the same as the outer diameter D2 (shown in fig. 5) of the hollow housing 50 of the conventional external brushless motor 1, the dimensional matching Tolerance (Tolerance) of the inner diameter D1 and the outer diameter D2 is tight fit (Tolerance), so that the circular tube body 201 can be firmly sleeved on the surface of the hollow housing 50 of the conventional external brushless motor 1, and a plurality of square sleeve holes 205 are formed in the disc body 202, the section size of the square registration hole 205 is equal to or slightly larger than the section size of the through hole 705 above the middle partition 702 of the centrifugal wind wheel 700, and the number and the position of the square registration hole 205 are the same as and corresponding to the number and the position of the through hole 705 above the middle partition 702 of the centrifugal wind wheel 700.

The right coupling plate 300 is a hollow disk body integrally formed by punching a metal material, the upper half portion of the hollow disk body is provided with a circular tube body 301, the lower half portion is provided with a flat disk body 302, and a trumpet-shaped arc portion 303 is gradually opened from the bottom of the circular tube body 301 to the disk body 302, the circular tube body 301 and the disk body 302 are connected into a whole, and the circular tube body 301 and the disk body 302 are perpendicular to each other, wherein a through hole 304 is formed in the center of the circular tube body 301, an inner diameter D5 (shown in fig. 32) of the through hole 304 is the same as an outer diameter D2 (shown in fig. 5) of a hollow housing 50 of a conventional external brushless motor 1, a dimensional Tolerance (Tolerance) of the inner diameter D5 and the outer diameter D2 is tight fit (Tolerance), so that the circular tube body 301 can be firmly sleeved on the surface of the hollow housing 50 of the conventional external brushless motor 1, and the disk body 302 faces the direction opposite to the circular tube body 201, and a plurality of square inserting pieces 305 which are mutually vertical to the disc body 302 are convexly arranged, the section size of each square inserting piece 305 is slightly smaller than the hole section size of the through hole 705 above the middle partition plate 702 of the centrifugal wind wheel 700, and the number and the positions of the square inserting pieces 305 are the same as and corresponding to the number and the positions of the through holes 705 above the middle partition plate 702 of the centrifugal wind wheel 700.

Referring to fig. 37 to 39 and 52 to 54, a method for combining a motor and a wind wheel fixes a motor 1 in a wind wheel 700 through a combination component, so that the center of gravity of the motor 1 coincides with that of the wind wheel 700, thereby achieving the balance and smoothness of the overall rotation when the motor 1 drives the wind wheel 700 to rotate.

The tight fit connection is a tight fit connection formed by material deformation of the combination member itself, or a tight fit connection formed by material deformation of the combination member itself and material deformation of the motor 1 and the fixing plate itself, instead of a fixed connection formed by welding, screwing, or the like.

The combined component comprises a left coupling disc 200 and a right coupling disc 300, the motor connecting end and the fixing plate connecting end are respectively arranged on the left coupling disc 200 and the right coupling disc 300, wherein the fixing plate connecting ends on the left coupling disc 200 and the right coupling disc 300 are connected together, so that the left coupling disc 200 and the right coupling disc 300 are connected to form the combined component.

Claims

1. The utility model provides a combined construction of outer rotation type brushless motor and centrifugal wind wheel which characterized in that: the method comprises the following steps:

an external rotor brushless motor, which has stator coil and ring magnet inside, and outside is composed of a round tube hollow shell, two disc side covers and a fixed shaft, wherein, the two side covers are pressed on the two end ports of the hollow shell, the fixed shaft is set on the center shaft of the hollow shell, and the two end parts of the fixed shaft are out of the two side covers;

the centrifugal wind wheel is formed by combining two frame ring plates, a middle partition plate and a plurality of straight blades, wherein the straight blades are arranged in parallel to form a circular ring shape and penetrate through the middle partition plate, and then the two tail end parts of the straight blades are respectively inserted and fixed on the two frame ring plates, the middle partition plate is positioned in the central position between the two frame ring plates, a circular opening is arranged in the center of the middle partition plate in a penetrating manner, and a plurality of square through holes which are arranged at the same intervals are formed in the peripheral plate surface of the circular opening;

a left connecting disc, a hollow disc body which is integrally formed by punching and molding metal materials, wherein the upper half part of the hollow disc body is provided with a circular tube body, the lower half part of the hollow disc body is provided with a flat disc body, and the circular tube body and the disc body are connected into a whole by gradually opening a horn-shaped arc line part from the bottom of the circular tube body to the direction of the disc body, and the circular tube body and the disc body are mutually vertical, wherein the center of the circular tube body is penetrated with a penetrating hole which can be sleeved on the surface of a hollow shell of an externally rotating brushless motor, the disc body is penetrated with a plurality of square sleeve holes, and the number and the positions of the square sleeve holes are the same as and correspond to the number and the positions of the upper-shaped penetrating holes of the middle partition plate of the centrifugal wind wheel; and

the right connecting disc is a hollow disc body which is integrally formed by punching metal materials, the upper half part of the hollow disc body is provided with a circular tube body, the lower half part of the hollow disc body is provided with a flat disc body, and the circular tube body and the disc body are connected into a whole in the direction from the bottom of the circular tube body to the disc body in a gradually-opened horn-shaped arc line part, so that the circular tube body and the disc body are mutually vertical, wherein a through hole is penetrated in the center of the circular tube body and can be sleeved on the surface of a hollow shell of an externally-rotating brushless motor, the direction of the disc body on the disc body is opposite to the direction of the circular tube body, a plurality of square inserting pieces which are mutually vertical to the disc body are further protruded, and the number and the positions of the square inserting pieces are the same as and correspond to the number and the positions of the through holes.

2. The combination of an external brushless rotor and a centrifugal rotor as claimed in claim 1, wherein: the inner diameter of the through hole of the left connecting disc is the same as the outer diameter of the hollow shell of the external rotation type brushless motor, and the dimensional fit tolerance of the inner diameter of the through hole and the outer diameter of the hollow shell is tight fit.

3. The combination of an external brushless rotor and a centrifugal rotor as claimed in claim 1, wherein: the inner diameter of the through hole of the right connecting disc is the same as the outer diameter of the hollow shell of the external rotation type brushless motor, and the dimensional fit tolerance of the inner diameter of the through hole and the outer diameter of the hollow shell is tight fit.

4. The combination of an external brushless rotor and a centrifugal rotor as claimed in claim 1, wherein: the section size of the square sleeve hole on the disc body in the left connecting disc is equal to or slightly larger than the section size of the through hole above the middle partition plate of the centrifugal wind wheel.

5. The combination of an external brushless rotor and a centrifugal rotor as claimed in claim 1, wherein: the section size of the square inserting piece of the right connecting disc is slightly smaller than the section size of a hole of a through hole above the middle partition plate of the centrifugal wind wheel.

6. The utility model provides a combined construction of outer rotation type brushless motor and centrifugal wind wheel which characterized in that: the method comprises the following steps:

an external rotor brushless motor, its inside has stator coil and annular magnet, and the outside is made up of a tubular hollow outer casing, two disklike side covers and a fixed axle, wherein, two said side covers are pressed on two end ports of the hollow outer casing separately, the fixed axle is put through the central axis position of the hollow outer casing, and two end parts of the fixed axle are passed through two side covers separately, in addition there are several grooves on the outmost edge surface of the two side covers to the indent;

a left connecting disc, a hollow disc body which is integrally formed by punching and molding metal materials, wherein the upper half part of the hollow disc body is provided with a circular tube body, the lower half part of the hollow disc body is provided with a flat disc body, and the circular tube body and the disc body are connected into a whole by gradually opening a horn-shaped arc line part from the bottom of the circular tube body to the direction of the disc body, and the circular tube body and the disc body are mutually vertical, wherein a through hole is penetrated in the center of the circular tube body and can be sleeved on the surface of a hollow shell of an externally rotating brushless motor, a plurality of square sleeve holes are penetrated on the disc body, the number and the positions of the square sleeve holes are the same as and correspond to the number and the positions of the upper through holes of the middle partition plate of the centrifugal wind wheel, and a plurality of stopping pieces are convexly arranged on the wall surface of an inner edge hole which is connected with the through hole on the end; and

a right coupling disc, which is a hollow disc body integrally formed by punching and molding metal materials, the upper half part of the right coupling disc is provided with a circular tube body, the lower half part of the right coupling disc is provided with a flat disc body, and the right coupling disc extends from the bottom of the circular tube body to the direction of the disc body, the circular tube body and the disc body are connected into a whole by the gradually opened trumpet-shaped arc line part, and the circular tube body and the disc body are mutually vertical, wherein, a through hole is arranged at the center of the round tube body in a penetrating way and can be sleeved on the surface of the hollow shell of the externally rotating brushless motor, the disc body faces to the direction opposite to the direction of the circular tube body, a plurality of square inserting pieces which are vertical to the disc body are convexly arranged, the number and the position of the square inserting pieces are the same as and correspond to the number and the position of the through holes formed above the middle partition plate of the centrifugal wind wheel, and a plurality of stopping pieces are convexly arranged on the wall surface of the inner edge hole connecting the end surface of the round pipe body and the through holes.

7. The combination of an external brushless rotor and a centrifugal rotor as claimed in claim 6, wherein: more than one circle of concave ring grooves are respectively concavely arranged on the outer surfaces of the hollow shell close to the two ports.

8. The combination of an external brushless rotor and a centrifugal rotor as claimed in claim 6, wherein: the inner diameter of the through hole of the left connecting disc is the same as the outer diameter of the hollow shell of the external rotation type brushless motor, and the dimensional fit tolerance of the inner diameter of the through hole and the outer diameter of the hollow shell is tight fit.

9. The combination of an external brushless rotor and a centrifugal rotor as claimed in claim 6, wherein: the inner diameter of the through hole of the right connecting disc is the same as the outer diameter of the hollow shell of the external rotation type brushless motor, and the dimensional fit tolerance of the inner diameter of the through hole and the outer diameter of the hollow shell is tight fit.

10. The combination of an external brushless rotor and a centrifugal rotor as claimed in claim 6, wherein: the size of the section of the square sleeve hole of the left connecting disc is equal to or slightly larger than that of the section of the through hole above the middle partition plate of the centrifugal wind wheel.

11. The combination of an external brushless rotor and a centrifugal rotor as claimed in claim 6, wherein: the section size of the square inserting piece of the right connecting disc is slightly smaller than the section size of a hole of the through hole above the middle partition plate of the centrifugal wind wheel.